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n-Butanol to iso-butene in one-step over zeolite catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
41397 45888 2011 11 PDF Available
Title
n-Butanol to iso-butene in one-step over zeolite catalysts
Abstract

The conversion of n-butanol to iso-butene in one-step has been studied over zeolite catalysts (Theta-1, ZSM-2, Ferrierite, ZSM-5, SAPO-11 and Y). The zeolites were characterized by XRF, XRD, BET, and NH3-TPD. Coke formation on the spent catalysts was measured by TGA. The unidirectional channel zeolites Theta-1 and ZSM-23 gave high yields of iso-butene and showed high stability. In contrast, ferrierite, although initially active, deactivated due to the presence of water from dehydration giving progressively lower yields of iso-butene. ZSM-5 showed high activity but low selectivity to iso-butene; SAPO-11 was structurally unstable under the reaction conditions. Ferrierite deactivation was studied in more detail by NH3-TPD, 27Al MAS NMR and by a comparison of 1-butene isomerisation with and without the presence of added steam. A similar comparison was made for ZSM-23 and Theta-1 which further emphasised their stability and showed that for these catalysts under the reaction conditions used, the product steam from n-butanol dehydration promoted iso-butene yield by acting as a diluent.

Graphical abstract.Figure optionsDownload full-size imageDownload high-quality image (132 K)Download as PowerPoint slideHighlights► One step conversion of n-butanol to iso-butene has been demonstrated. ► Medium pore size, unidirectional channel zeolites show high performance. ► The productivity of iso-butene over Theta-1 was greater than 7.0 kg kg cal h−1. ► n-Butanol to iso-butene is compared to isomerisation of 1-butene with added water. ► The deactivation of ferrierite is attributed to the effect of product steam from dehydration.

Keywords
n-Butanol; iso-Butene; Dehydration; Isomerisation; Zeolite
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n-Butanol to iso-butene in one-step over zeolite catalysts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 403, Issues 1–2, 22 August 2011, Pages 1–11
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us